Rescue blanket keeps in body heat and preserves body temperature. Small enough to fit in most first aid kits or backpacks. Great for camping, hiking, first aid kits, survival kits.. The blanket retains up to 90% of your body heat to prevent hypothermic reaction even in sub-freezing temps. The blanket also limits your solar exposure and deflects heat from the sun. The shiny side also doubles as a mirror to signal for rescue.